Pyridine coupled mono and bisbenzimidazoles as supramolecular gelators: selective metal ion sensing and ionic conductivity†,Materials Chemistry Frontiers

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Pyridine coupled mono and bisbenzimidazoles as supramolecular gelators: selective metal ion sensing and ionic conductivity†
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2017-12-26 00:00:00 , DOI: 10.1039/c7qm00505a
Santanu Panja _{1,

2,

3,

4} , Subhratanu Bhattacharya _{2,

3,

4,

5} , Kumaresh Ghosh _{1,

2,

3,

4}

Affiliation

Pyridine coupled mono and bisbenzimidazoles 1–6 are synthesized and their gelation properties are examined in various polar as well as nonpolar solvents. Among the structures, compounds 1 and 2 form instant gels from DMSO/H₂O and MeOH/H₂O solvents. The gel states of both 1 and 2 are responsive to Ag⁺ and Cu²⁺ ions whereas the gel to sol transition of 2 in DMSO–H₂O is additionally caused by Hg²⁺ ions. On the other hand, compounds 3 and 4 produce gels only in the presence of Ag⁺ ions under similar conditions and validate their visual readout. In relation to this, the nongelation behavior of p-isomers 5 and 6 (structural isomers) under identical conditions emphasizes the positional role of the pyridyl ring nitrogen with respect to the imidazole ring. Furthermore, metallogels of 3 and 4 exhibit thermally activated ionic conductivity due to movement of Ag⁺ ions within the gel network.

中文翻译：

吡啶偶联的单和双苯并咪唑类作为超分子胶凝剂：选择性金属离子感测和离子电导率†

合成了吡啶偶联的单和双苯并咪唑1–6，并在各种极性和非极性溶剂中检查了它们的胶凝特性。在结构中，化合物1和2由DMSO / H ₂ O和MeOH / H ₂ O溶剂形成速溶凝胶。1和2的凝胶态均对Ag ⁺和Cu ²⁺离子敏感，而DMSO–H ₂ O中2的凝胶至溶胶转变还由Hg ²⁺离子引起。另一方面，化合物3和4仅在Ag存在下才产生凝胶⁺离子在相似的条件下，并验证其视觉读数。关于这一点，在相同条件下对-异构体5和6（结构异构体）的非胶凝行为强调了吡啶基环氮相对于咪唑环的位置作用。此外，由于Ag⁺离子在凝胶网络中的移动， 3和4的金属离子显示出热活化的离子电导率。

更新日期：2017-12-26

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